.item {
    /* border: 1px solid; */
    height: 60px;
    padding: 0 30px;
}

.header {
    height: 60px;
    line-height: 60px;
    background: rgb(0, 0, 0, .5);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
}

.aside {
    position: fixed;
    top: 60px;
    left: 0;
    width: 200px;
    height: 100%;
    transition: .5s;
}

.main {
    height: calc(100vmin - 60px);
    margin-left: 200px;
    margin-top: 60px;
    transition: .5s;
    scroll-behavior: smooth;
    padding: 50px;
    overflow: auto;
}

/* 标题处理 */
.header h1 {
    font-size: 1.5em;
    color: #76a2c0;
}

/* header布局 */
.header {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
}

/* 侧边栏布局 */
.aside {
    padding: 10px 0;
    background: rgba(68, 216, 150, 0.5);
    overflow: hidden;
}

.aside-list .list-item a {
    display: block;
    height: 100%;
    position: relative;
}


.aside-item {
    height: 50px;
    line-height: 50px;
    padding: 0 10px;
    font-size: 16px;
    cursor: pointer;
    position: relative;
}

.aside-item {
    color: #fff;
}



/* 子菜单 */
.aside-list .list-item .menu-item h2::after {
    content: '>';
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
}

.aside-list > .list-item > .menu-item {
    margin-left: 0;
}

.sub-menu .sub-menu-item {
    margin-left: 20px;
}

/* 1级hover */
.aside-list h2 {
    user-select: none;
}
.aside > .aside-list > .list-item > a:hover {
    background: rgba(68, 216, 150);
}
.aside>.aside-list>.list-item> .menu-item > h2:hover {
    background: rgba(68, 216, 150);
}

/* 2级hover */
.aside>.aside-list>.list-item>.menu-item>h2 ~ ul > li > .menu-item > h2:hover,
.aside>.aside-list>.list-item>.menu-item>h2 ~ ul > li > a:hover {
    background: rgba(68, 216, 150, 0.5);
}

/* 3级菜单 */
.aside>.aside-list>.list-item>.menu-item>h2~ul>li>.menu-item>h2 ~ ul > li > a:hover {
    background: rgba(0,0,0,.5);
}


.sub-menu {
    transform-origin: top center;
    transition: .5s;
}
.sub-menu.hidden {
    transform: scaleY(0);
    height: 0;
}

.aside-list .list-item .menu-item h2.hidden::after {
    content: '>';
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%) rotate(90deg);
}

/* main 布局*/
.main .iconfont.shousuo {
    position: absolute;
    left: 0;
    top: 0;
    cursor: pointer;
    user-select: none;
}

.main {
    position: relative;
}



/* header消息区域 */
.header-info .msg {
    height: 60px;
    line-height: 60px;
    margin-right: 20px;
    overflow: hidden;
    color: #fff;
}
.header-info .msg li {
    transition: 1s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.header-info {
    display: flex;

}